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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72e6e8a8ec16b835b673116079d486f4af1d598446b3c05d004f09b7047dd7c' 
  AND token = 'VDvUF5rKSZ5cCJe9GboMgQSa9hej9PxiQO6e8nZLwv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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