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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b5513ff3a9501e7e8dde7eddee76c5d92c0af6c0bc92baabbd8bdd64e72cfc' 
  AND token = 'MHkKocKPzO2ghZKjwQw9H8aUI/5SThQSORXH8inGGwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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