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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce5be02c750e90aa649ae7b21204883cb00a4c721824d90ca680eb27f123dc8' 
  AND token = 'CKnh9h6aGqFLMyzyzdEaFmipZnFmvIGO5j7rT1ncsM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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