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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73848d8fb52553da89e2ab843458d951ed187bf73c8bc1d20a3d64f4b298956' 
  AND token = 'yhTi64HE+SnzWfTldg0vmDgfRVSvPYdEhEmjun59eOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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