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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d71debe7de36e5da5e50a195bb3b020c538d8df03ee706f83bbbe7238010cf' 
  AND token = 'Fc1Xfkw7Pb+gG+t5xZ5Z2mk4paRqDfwh/FWRTMtRvVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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