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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e459e26a9e38ba74dc975e838ebf0854d7914194981efbb6eebde21a3a1739e' 
  AND token = 'Hl+UsPXXobyh4v8Vh0oflnl3Ci8XC7tYsg+FEOb5CQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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