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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a52b6f153e3b3509d4683e8b1a361cb5a1948c3b84cabd1da87ee882ba7da5' 
  AND token = 'M1KDQRktAas1t5iuuzTyiWMLM0zuaWVJI3zQTOub9/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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