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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cdf4df1ee4ca90d1719a4f205ce7e7f1ae906cf3f1058906529db93dc4851f' 
  AND token = 'uVjrel64bOU4vsoWJL0Dbazms9B1ZFJIgXDPL1giAaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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