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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e25d0047d72f5999a54b9167cc323c4bd6c1ed1b790b4cee057ed4e902feccb' 
  AND token = 'MhlNO6ofwnkX5r5XMfQoT9dqeCWy+MPM28ObUjd4ZrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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