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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc18916f7f25c51217897c102f5916016b5a97c20b18976a3e303679d84eb96' 
  AND token = 'ZrbkJCOEHdu0zL0nsbJ3LdmF2P7l+5GaaqhkgrH8FdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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