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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e46624239c727ed225deb7557b14c3fff2b2a98b5eeb223377fd51c0a7253e1' 
  AND token = '7FihQ8WCtk9VOadkzBefqha9YGEFukt1ffTK8enoOn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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