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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909dbbf7d2568a0859b71ee60d107d14e803df907fc5d9eafc51f1edae7a7659' 
  AND token = '3SMrBJbejrouvaldP/jAd2aOiQ7LDj2pCt7arLqBpe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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