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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34adeda3b3a3dbb0b4d585412705d565a42abc55b04820da172665277b7d31c3' 
  AND token = '3nUPjLgNvdE/7ty4bmnY+8JBID6WwTI9zCF6Z6MMStc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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