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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da73e32ed0c98adcbd8dae4f05f0976c9a7e1f4f25e8a198e2598aee5026f0af' 
  AND token = 'fJ1ziPCnonvftBugDZlbvpdRqibMqYZhrN1ExnVEkRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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