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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8f9c55bed1a9992b2e9893c61ecce15d404c53e139eafbd5beae2e8be0604f' 
  AND token = 'LfOej5cB+otQHnHBaEGomXSXKEy6FfwmOKIV/tYV/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01115

JSON explain

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