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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26a43d1c8cc5f0a4d415ed4434c057b398bf43b866b691aaeeba4c44500378a' 
  AND token = 'WKq+aqfrNF5U/z8lDtx11Qo+iK/6iUch+Zafotqjb0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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