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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a834902f7cec71ca9705cbdd32360253440c0abc9873ba3f7969cb5d7ec527c' 
  AND token = 'Qt2uPb/1i252NCzIlKts6A87eaxSL7XGZIEkAsq2K/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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