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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1591c6de7e3ee51ad082cbc70e8dc3770c99a1d1ad9fd5d47bae75e9659449dc' 
  AND token = 'g6WXxV7dinZD/UfGjH6p0mvNYPB6P1qL5veyXLt4bOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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