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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a8754e782c7cd9a5c51bd30b652cd9e2054fc0419d8ba26ebfd769196757a0' 
  AND token = 'aBmML61bVRx6aQO2qGR0gAUcPtjFSiDIX36lMiyN3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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