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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69754dab5587d842adbfcb108a4987d9da03b63670d72aa9f9f3573eb8bfa2c' 
  AND token = 'Z909J+4eKjW1d7fcGoVzNsxisCx1Ogb1EjPUF9/XGM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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