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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f792aaa1313fa2d30d3c03b8701ebdd0eb27ae300bf0f0ed55e1de59691ace3e' 
  AND token = 'J+L9u8sxbz816B2sfK2ic6qZ+xcAoPLxWRyox1VRffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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