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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a2a7b202740b9e094bee82d1515a11177b9c4a13dbfd146a6cf6323778a6c7' 
  AND token = 'uGE5f3895zz1rgGFQUpLZPQwcMobYp7g2JcrzWGMqfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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