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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0dca14993a331f3d3c403e88773ab7cea524a7bf6bcd6cebb0b31db8aecfdf' 
  AND token = 'Z1tHEFAZK6x7J6310DB+n887EQ30/8r62DMFyD4FOKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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