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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e8d435004c17039c516082dc00044767bcd4261023109124500ed4457e8ba4' 
  AND token = 'P7FF8ClJRDwABePONbLhwdXX1/zvWJ4RIMZQtdmPwp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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