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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cd017cc5d21edc941edb2a8dd8a0bf7b3e1a49bf09f3461258fd68ad9c647' 
  AND token = 'Qt7R7uaMm/9CB5jKtEl8+E3Kv+I01Pv/uGLydQBIBdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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