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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2514de34e282139569866f16ef80c8447d44e335da7e8f2b24a6f94fabc4a3' 
  AND token = 'Wk8FHIKsWg0FotqkIG4Cmi6ss+523G1geOMBmZwVCDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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