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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd40274dec3e77208d0733ab39e2e9772f0c29a1196dd6cb68f094fca0f03d39' 
  AND token = '/FhSq3Ow+wPKuHr8zeJPxS9nLMiqggNhR1hTozdX+M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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