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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6073b24fdd115a561ba9567793e5bad02c3c891d3c83d77b0e8f752a40246f7' 
  AND token = '2IV0K+5hK5cr9kfVk0c3+ElKHd/s9zCPuRyDYiZOad8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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