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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2805020fde6ea84dde9df2d1fa9841460f51dac99116bdedb7968be8af0685' 
  AND token = 'GQ2FS9v8n4uUz92QFTY47HcPYVQRCN8wdYBM62gn9OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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