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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e74d96a2363e308b8a89bde8a3e65109cfd2605091074e4c720ae01e9de37d' 
  AND token = 'y7QOaTAX1v8Au232ZDBZSMS7HGnGRoZ6y6zVQoEGySM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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