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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc552cb4e7d2308b7062c166cfe3878df85e51e1c9c565af99f2edad75db8589' 
  AND token = 'jqWjnV/IkA98WsaW/3eg43ZY6AYFp+WJWCelSeamiQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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