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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0df849c0c4d7fd128b3cfc9c9e0ee59073c39b59ed4c5ea9dd2f6d0372155a7' 
  AND token = '3djhuEMjPp0y9gMlYOaJWeYVstan2MOZhPHT8GrwkAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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