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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4912873c7d9a0154b0d14506fb20143db591cb12bcd99d9fd8ff1a6cc72dfef5' 
  AND token = 'GcmtyphK6shQHIo7xuSN9x72zhjlGQZPfdv+dSzm9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}