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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3cd158c37446fc9bf07311bc8d4d18b74901b3d308586f5a292429390013c8' 
  AND token = 'iQga8VlFtg1wlXT86Ou6ei4sKnctgXYjura4JSBs/dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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