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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec87efdfdd844a695a6742a901918de6b842ecdee0df3407e646f71fd47ee3d' 
  AND token = 'ZCVLs+uIEHyMBB0HT5wID/9M1MrzMSQOVBGhbY01xg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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