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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b2af0c24051ade3c1e5b89cd20223af45cde730677152d93d9004a8a913624' 
  AND token = 'OoKq7PKRAW2vPm1CVnb4Ge2lw0ZyzYdRjHqe3giTXOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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