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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346b115ac1010d99d370d9e8a2b38152052de44ed68e123a8bdd29a9631261d7' 
  AND token = 'aUcSc5Vqil+WoYmRXsMO29+XA+U4GmS0CRatyvD9cXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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