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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e068bc806c5707f420778e4d8ab186749007cea4ab2c5dfdd93128897f2987f9' 
  AND token = 'BdYCDH0FaooBeOhXl2Y3iYZEyV1HkbwH3n9TfyivS/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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