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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76a7f44b24208b6e67567e59169722ecdbd00d1c964613b1691a11eaa5d48af' 
  AND token = 'AXCZ4aFg85j3XKmCW50muwo+h3AcqLO6Mh4xfDa6CDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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