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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a109fea49d6bfd760ae8e4e8633b2125c24d1141ff6e29cb54bbd68dd9efc695' 
  AND token = 'vBxkSWbT54ss9Kk09Bal1BeyWiMgrDVK1ihszJDsges=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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