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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfc9cd7fabccd5efa47a04785387591f345e97f3881422566451e50f5efedd5' 
  AND token = 'I2VEtIm2GFWIsYnG/dyanu4gPyN0kU3ul7rm8trZhLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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