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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ef5a9cf7c3c4d5b5b10da221d434a499ec609cd9520ee38f4928033ff6165b' 
  AND token = 'f0obembGSS7CnrrWijjOXgIX3KiwX59NNOhSHqmnfiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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