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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924a2dcf5dd30399a0bd0178f831bac9f7142af2c6455f336eb7bcec2014a380' 
  AND token = 'uSMt44BXrPXFXc6hFZNf7njKByzAjumG9aHZQE6vFhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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