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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46f76517f8e5f351902fad200dec3c923728bc12323e19839e3fee4f9cf9e83' 
  AND token = '5JFPJHzkrkdiM0IB3DeBPuZ6BfypXxl9Sgk2wq6YHCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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