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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23660367e82cb060eaf9b8a2873d0fbe238ebeeb3d3b011f987e5b8b8baba99c' 
  AND token = '6AJshscxz5pkZSMrUzO2hsi8zTUEBFe8Clr8Fa1pTWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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