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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241d4de886ebc7ac0798ef01095f5b1ba254c53366030cff4041c9d4193f25d2' 
  AND token = '/YNluFNyCSqTNEmG6iawIlWs8F9xDFpKijcoiXZ3CDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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