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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88031cf2cd9eef8601e2876461c0e00c8c5a141e065d7a0bc9f3d2c144ac22c' 
  AND token = 'S4lv64sTYUhqh7gzI5reScBvjKXvCxKYlv3wr4ooAag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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