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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb19bb871c2d0e92aa2675522a50cd313865ec9273492947dbd20c67507b3840' 
  AND token = 'j8P7aIwDCtH6EV4FGi6/cI/Io6JC77z6b8ZyNnN4DLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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