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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0febad028f760173fdc316c6057e853b07bb7cc1491fc1780df4d7021f468f6' 
  AND token = 'Mm/Pc9lyKKzvd+uEoEUE7H4B9gxOwF9t1GSkVOX0y/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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