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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b5e3ad5cfa5a1633d93101afea6d58c86cc816c187de8bc5ae5615bfe3353d' 
  AND token = 'ImfNLrvpozNa/Xp9Nw/96tNwkbdf3WhppBiy416QO8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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