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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f0cc2521e306e663710d09813652f9e35bf14a23b8103274c99194ccab5524' 
  AND token = 'nWClJM379Tg35dzZaOzmaml3iBHfdi4w3UU+RwEK+TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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