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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9176933b87d63c9e00b653eeaea8a77f67f0d5a5d6799d2825d99df7698aac' 
  AND token = 'wNsxf6qu8oPCF8bDHpX4fjEMtxlkntz0mvv0VuNqpWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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