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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562ef855a1516ec92817432598c308171e889c8051b4c9702cd9d68493f81911' 
  AND token = '1nRp95StiLCitVV5DC+iCsvOq2/7ShqCVN4Cy4k1Q34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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