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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92a12e3fd24641420e95aa3aabe40bc29499c0a60d6e457b307b2009975f976' 
  AND token = 'gGcKAQryUQ3vudVO4t1S9q4X0FxfQ+DZGSTE+8QRRJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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