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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00af03221755a578077ad11a351e74ef029fc87f88ebf5e7da43bfdc9ae7676f' 
  AND token = 'ApsLtTF7oxPVYH8b2p9TWq+riQobv5RZvWyz2Pa/oCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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