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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624bcb8307ff7a8f0b13c3795bc53e6d2c9c04a8c46068ac94c0e39b731cd7d2' 
  AND token = 'rp4UK041/333MYsrAWlU4m3U+aQ3AQqWmLL8CVV/dLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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