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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef9a4f41c90872889b43ec1f0844bbe57555a9b21ea1f066dc10bb34ed92931' 
  AND token = 'PWDiYEdxp4sSYPTPO2qiYJeZu2cnb5i1I8rPXqjx+eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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