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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba55c56b9da8665bb97f4c92894b7730134267dc4038e7aad072ade446874855' 
  AND token = 'wAqXwWycEm/GONYbOQxNIXqwO4ShP8VxCK/8+Rusi78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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