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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ea96a86f3b33da916a5954098c9d04f5fb0cc865c9a21e9a1679e9fa5b9088' 
  AND token = 'Ja1bFnRT6DYLx1Q3biUpkUHwBo3HUim+pGuQKaJt/g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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