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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7854d7a2884420cdf0d4fa4a3d5708ae9c6af75ef6664bfc43d7c5dc46de3f4e' 
  AND token = 'yKbYvFtexPZIf5Usup9fxTlVoeIlp88BJBgGbPaZKKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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