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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0304cc57990996e71c7ee733c73e04088123e905a15778c7f877aa79f4e9d439' 
  AND token = 'amfqU+zS4KlY3FYwu/GrB9J0R3yaLEx7JMhqN7eWmEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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