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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ca27415dbe41e39d728ec1226cbd1555b32bb2ed15b15862ca91cdbeb6117b' 
  AND token = 'cifbaoco8lM0GkHEl6YE8o+llI/qQg0OJ+tusBF2K6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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