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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137e95886ff39cff69757667ca07dec008207337f7016e5e20af3248fec652c8' 
  AND token = '6p0jEXRHpE0Jh3tYA1/6li6PH5+Q2nrQnSCqXooGHpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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