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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935259853d87bf01c17f7e16ee333df6f06f4194d9e7fc3036455baebf23a5ad' 
  AND token = 'X/Oo+LBZopA8mQg1E6nN51q/l3LSooqJy1/Oa1aIL68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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