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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c25823629672d0be7f6cb866cc203ade395688e6d22786a17447226460e179' 
  AND token = 'rVNO4I+ZkkUDDFSZ1hLeSzWEg+zJgS+8p+y9tPDuDlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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