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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3cc3a2d2fddd3f4906de0ad1c3dfa4ad2cafd2578727332f80bf8a07bf40bf' 
  AND token = 'q0MH6wY/Qj+RDivfQ5jgdkH+lOYki40lb7oIvTncxeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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