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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361f0e7df6c56eb4a162f421ca50b2571237506a2c0dc247e42e38423d3f72f' 
  AND token = '0WMma7TD5D65RnkPQ8BpYQmrYdEgzP4xfMziEAArxUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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